As you can see from the latest post over there from Kevin Brace, who is the xf86-video-openchrome maintainer, the DVI issues were fixed for some HP thin clients with xf86-video-openchrome 0.4.181 and later.

So, I don't know why Juanito posted the old version 0.4.0 to the Tiny Core Linux 7.x repo.

Maybe if Juanito would update to the latest version 0.4.901, the DVI issues would be solved.

As you can see from the git log and the comments on the bug report mentioned above, Kevin Brace is currently busy at improving xf86-video-openchrome, with almost daily commits, so it would probably be best if Juanito would update to the latest version.